Diagnostic Routine H

Diagnostic Routine H

Diagnostic Overview

Incorrect Speedometer Indication

Normal Operation and Fault Conditions

REFER to Speedometer .

If the vehicle speed message is missing or invalid for 2 seconds or less, the IPC (Instrument Panel Cluster) defaults the speedometer to the last speed indication based upon the last known good message received.

Visual Inspection and Diagnostic Pre-checks

Verify that the tire size on the vehicle matches the tire size listed on the VC (Vehicle Certification) label on the LH (Left Hand) B-pillar. REFER to Vehicle Certification (VC) Codes .

Pinpoint Test

1. CHECK THE TIRE SIZE CONFIGURATION

1. Using the scan tool, view Module Programming for the programmed tire size.

2. NOTE: The correct tire size can be found on the VC (Vehicle Certification) label. REFER to Vehicle Certification (VC) Codes .
Verify that the size of the tires installed on the vehicle matches the VC (Vehicle Certification) label.

3. Verify that the tire size configuration matches the VC (Vehicle Certification) label.

Is the tire size correct and is tire size correctly configured?







2. RETRIEVE THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE IPC (Instrument Panel Cluster) SELF-TEST

1. Using a scan tool, perform the IPC (Instrument Panel Cluster) self-test.

Are any DTCs (Diagnostic Trouble Codes) recorded?







3. RETRIEVE THE RECORDED DTCs (Diagnostic Trouble Codes) FROM THE ABS (Anti-Lock Brake System) MODULE SELF-TEST

1. Using a scan tool, perform the ABS (Anti-Lock Brake System) module self-test.

Are any DTCs (Diagnostic Trouble Codes) recorded?







4. CHECK THE SPEEDOMETER OPERATION USING THE DEALER TEST MODE

1. Ignition ON.

2. Monitor the speedometer.

3. Ignition OFF.

4. Enter the Dealer Test Mode. REFER to Dealer Test Mode .

5. Scroll to gauge sweep.

6. Monitor the speedometer when the gauge sweep initiates.

Does the speedometer begin at 0 km/h (0 mph) move to 257.5 km/h (160 mph) and return to 0 km/h (0 mph)?







5. CHECK THE PCM (Powertrain Control Module) VEHICLE SPEED PID (Parameter Identification)

1. Using a scan tool, view the PCM (Powertrain Control Module) vehicle speed PIDs (Parameter Identifications).

2. Monitor the PID (Parameter Identification) (VSS) with the vehicle speedometer indicating 32.2 km/h (20 mph),64.4 km/h (40 mph) and 96.6 km/h (60 mph).

Does the speedometer indicate between 32.2 km/h (20 mph)-35.4 km/h (22 mph), 64.4 km/h (40 mph)-70.8 km/h (44 mph) and 96.6 km/h (60 mph)-106.2 km/h (66 mph) at the 3 PCM (Powertrain Control Module) PID (Parameter Identification) values?







6. OBSERVE THE SPEEDOMETER OPERATION

1. Ignition ON.

2. Observe the speedometer with the vehicle at various wheel speeds and stopping frequently.

Does the speedometer begin at 0 km/h (0 mph) and fully return to the 0 km/h (0 mph) position when the wheels are stopped?